Device for positioning tools to be dressed.



A. N. HANTON.

DEVICE FOR POSITIONING TOOLSIO BE DRESSED. APPLICATION FILED IAN.25, 191s. RENEWED IAN. 25, 1919.

1,295,982. Patented Mar. 4,1919.

INVENTOR.

ATTORNEYS.

UNITE fiTATEfi rarnnr onrron.

ARCHIIBALD 1v. 'I-IANToN, or INDIANAPOLIS, INDIANA, A'ssrcnon, BY ransnn AssIGNMEN'rs, T WILLIAM BARTLETT.

DEVICE FOR POSITIONING TOOLSTO BE DRESSED.

Application filed January 25, 1918, Serial No. 213,714. Renewed January 25, 1919.

To all whom it may concern:

Be it known that I, ARGIIIBALD N. I'IAN- TON, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Devices for Positioning Tools to be Dressed, of which the following is a specification.

This invention relates to a device for positioning tools, gages, milling cutters and the like, in planes of determined degrees, minutes and seconds relatively wheel for dressing and redressing the cutting edges of various instruments to coincide with the angles desired, without reverting to the use of the sine-bar, and being an improvement on my co-pending application No. 192,668. a I

The object of the present invention con-' sists in the provision of certain means, in addltion to those disclosed In my former application, whereby greater accuracy-being the crux of the end sought-can be more readily attained and with greater ease than has heretofore been possible in a given time.

I accomplish the above object of the invention and such others as may appear from a perusal of the specification and claims,by means of the construction illustrated in the accompanying drawings, forming a part hereof, in which Figure 1 Isa top or plan view of my pres ent invention.

Fig. 2 is a cross sectional view on the line 2-2 in Fig. 1. Fig. 3 is a front elevation of the device. Fig. 4 is a cross section of the device on the line 3-3 in Fig. 1. Fig. 5 is a perspective View of the stop-gage. Fig. 6 is a fragmentary detail sectional view on the line 66 in Fig. 1.

Referring to the drawings, the device contemplates a base-plate provided with laterally disposed cars 16 provided with slots 17 through which suitable bolts may be passed for securing said base-plate to the grinding machine, not shown. Base-plate 15 is also provided with an integral ear 20 which supports a vertically disposed fixed pin 21, the object of which will be herein Specification of Letters Patent.

to the grinding placed into position,

' Patented Mar. 4, 1919.

Serial No. 273,172.

be properly located upon the surface'of table 24 relatively to the grinding tool, said table is provided withslots 25 and 26 arranged at right angles to each other and intersecting at the axis of table 24. These slots provide guideways-for a bolt or bolts 27 by which the tool-holding stand 28 may be moved and secured at the desired place upon the top of table 24. The device is made in various sizes, and in the smaller sizes, with short radii, I provide a single bolt 30 at the axis of base-plate 15 and table24 for preventing displacement of table 24 from recess 22 in base-plate 15. One end of bolt 30 is let into an opening in the underside of the dependin extension 23 and bolt 30 is retained in table 24 by means of a threadedplug 32. Bolt 30 passes through an aperture 33 in base-plate 15 and is provided on its free end with a nut 34. In the larger devices where the lengths of the radii afford increased leverage, where the stress exerted 30, I provide additional means for adequately securing table 24 comprising a pair of clamping bolts 37 The heads of bolts 37 are let into a circumferential groove 38 through an opening 39 (see Fig.2), and extendthrough an aperture 40 in the horizon tal shoulder 41 formed by under-cutting the side edge of table 24. The under-cutting of table 24 affords the necessary clearance for the nuts 42. When one of the bolts 37 is and before said bolt is tightened, table 24 is rotated until aperture 40 in the opposite side of table 24 is brought into alinement with opening 39. By means of the bolts 37 table 24 may be held against displacement when the same is properly adjusted. Table 24 is provided with a laterally disposed integral lug 45 which carries a downwardly disposed .pin 46 which, when the table 24 is rotated, may be brought into alinement with fixed pin 21 in ear 20 of the base-plate 15. When pins 21 and 46 are alined the device stands at zero, or in its initial starting position. To bring pin 46 quickly into approximate registration with pin 21, when table 24 is moved back to zero, I provide a stop-collar 50 having a longitudinal bore to receive pin 21. Collar 50 is provided with a laterally disposed shoulder 52, having a knurled periphery enabling said stop-collar to be easily rotated around pin 21. The upper end of stop-collar 50 is parwardly disposed extension 51 for engaging and arresting the movement of, and for alining pin 46 with pin 21. Il -view of the fact that the working range of table 24% extends in both directions from pin 21, stopcollar 50 may be rotated so as to bring extension 51 on the desired side of pin 21, thus insuring an approximate vertical alinement of pin 46 with pin 21 when-table 24. is moved back to the position indicating zero. At the proper point of adjustment table 2% may be secured to base-plate 15 by means of the bolts 37. In case the operator moves table 24 to cause the latter to rebound slightly'bytoo harsh an impact between pin 46 and extension 51, so that pins l6 and 21 are not prop erly alined, the slight variation between the two pins may be easily corrected by meansotathreaded b01t55 which is pivotally secured at one end to lug 45, on table 24, by means of a screw 56. Bolt 55 passes through a pair of arms 57 in the slotted end of a standard 58, the latter terminating in a dove-tailed shaped sliding block 59 sliding in a correspondingly shaped groove 60, cut into the periphery of base-plate 15. Arranged in the slot between the arms is a revoluble thumbnut 63, so that by rotating said thumb-nut minute adjustment can be imparted'totable 24. VVhen table 24 is rotated block 59 is carried around in groove 60, and when table 24; is brought to the desired position, said table may be held by means of a thumb-screw 62.

passing through block 59 and bearing againstthe adjacent wall of grove .60; r

The operation of thedevice is as follows Assuming that table 24: is to be set at an angle of say 20, the operator moves table 24 until the distance-from the outside of extension 51 and pin 46 is secured, this distance being ascertained by taking twice the sine of one-half of the angle desired (in this instance 20"), times the radius of the devicethe distance between the axes oftable 2i and extension 51plus the radii of said extension and pin 46, at whichpoint table 24 is secured by means of the thumb-screw 622.

Having thus fully described my said invention, what I, desire to secure by Letters Patent, is-,

1. A device of the character described,

comprising a revoluble tool supporting table,

indicator-means for locating the point of Copies of this patent may be obtained for starting the table, a base-plate for said table to revolve upon, and stop means rotatably adjustable about its axis to enable said stopprovided in its surface with a pluralityof radial grooves, a tool support on saidtable, means arranged in the radial grooves for se curing the tool support, indicator-means for locating the point of starting. the; table, a base-plate for said table to revolve upon, stop-means on said base-plate for arresting the movement of the table at the point of starting.

4-. A dev ce of the character described comprising a revoluble tool supporting table I provided in its upper surface with a plurality of radlal grooves, indicator-means for determining the point of" starting the table,

a base-plate for said table to revolve upon, stop-means on sald base-plate forcontacting the indicator-means andfor alining the 1011- gitudinal axes of said indicator and stopmeans. i

5. A device of the character described comprising a revoluble tool's upporting table, indicator-means for determiningithe start ing point of the table, a base-plate for said table provided with" a peripheral groove.

means on said baselate'for contacting said indicator-means ant arresting the moving table at the polnt of starting, a threaded bolt movingwith said table, a standardmoving in the peripheral groove in the base-plate and supporting the free end the-threaded. bolt, meansfor securingsaid standard within said groove, and athumbnut forinoving the threadedbolt longitudinally and for imparting fractional degreesof movement to said table. t

In witness whereof I have hereunto set my hand and seal at Indianapolis, Indiana, this" 18th day of January, A. D. one thousand nine hundred and eighteen.

AROHIBALI) n-lnnroa. a a] five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

